DAYTON, Ohio (AP) — Officials at the U.S. Air Force museum in Ohio are checking the gas tanks of all their vintage planes after someone discovered one of them apparently has held 200 gallons of fuel for more than four decades.

Procedures at the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base near Dayton require all aircraft to be defueled before they are exhibited. Apparently, that never happened when the A-1E Skyraider arrived some 44 years ago.

The Dayton Daily News reports that restoration crews reviewing old records discovered there was still fuel in the Skyraider, a propeller-powered attack plane used in both the Korean War and the Vietnam War. A crew purged the fuel over the weekend, forcing the temporary closure of some of the museum galleries.